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Updated: Jul 25, 2025
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Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
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Optic Nerve Sheath Diameter in Hyponatremia: A Closer Look
Jes Jose1, Varun Suresh2, Rohan Magoon3
1Department of Cardiac Anesthesiology, Sri Jayadeva Institute of Cardiovascular Sciences and Research, Bengaluru, Karnataka, India.
Summary
Optic nerve sheath diameter may increase in hyponatremia, a condition of low sodium levels. This finding suggests a potential non-invasive method for assessing intracranial pressure in hyponatremic patients.
Area of Science:
- Ophthalmology
- Neurology
- Critical Care Medicine
Background:
- Hyponatremia, a common electrolyte imbalance, can lead to neurological complications.
- Assessing intracranial pressure (ICP) is crucial in managing patients with hyponatremia.
- Non-invasive methods for ICP estimation are highly desirable in critical care settings.
Purpose of the Study:
- To investigate the relationship between hyponatremia and optic nerve sheath diameter (ONSD).
- To evaluate the potential of ONSD as a surrogate marker for elevated ICP in hyponatremia.
Main Methods:
- A prospective observational study was conducted.
- Optic nerve sheath diameter was measured using ultrasonography.
- Patients were grouped based on serum sodium levels.
Main Results:
- A statistically significant positive correlation was observed between the severity of hyponatremia and ONSD.
- ONSD measurements were higher in patients with symptomatic hyponatremia compared to those without symptoms.
Conclusions:
- Optic nerve sheath diameter may serve as a useful, non-invasive indicator of elevated intracranial pressure in patients with hyponatremia.
- Further research is warranted to establish ONSD as a reliable tool for ICP monitoring in this patient population.
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